The fact is, there is not much I can think to say about this, other than the truth. I have wondered, for some time, how peanut butter would work in a latte.
It's thick, but not really more so than mocha or caramel sauce, both of which mix just fine in espresso and steamed milk.
It's not sweet like the usual syrups and sauces, however. At least, not very; most peanut butter is sweetened a tad.
Finally, I had the chance to try this concoction, which had previously only existed in my imagination. My new place of employment, Seattle's Best Coffee, has packs of peanut butter, lightly sweetened with honey, which are kept on hand for pretzels, bagels, and whatever other starches someone might fancy applying it to.
So my boss and I steamed up some whole milk. Or rather, she did. I should note that she did quite a nice job of it too. The texture was rich and thick, stretched to the point of a creamy consistency. The espresso was, well, what it is when it's pulled from an automatic machine. It's consistent, and quality. Those ingredients, by themselves, make a quality drink. I know, because I've had the combination.
But this time, there was peanut butter. The result, sadly, was neither blissful nor catastrophic. It added nothing to the texture, surprisingly. As far as flavor goes, little was gained. A slight nuttiness -- peanuttiness, you might even say.
Double the peanut butter, and perhaps a separate packet of honey, and the result may have been more noteworthy. Perhaps, another day.